Date:	Mon, 01 Nov 2010 16:15:34 -0400
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Gael Le Mignot <gael@...otsystems.net>
CC:	linux-kernel@...r.kernel.org,
	Ian Campbell <Ian.Campbell@...rix.com>
Subject: Re: Kernel bug on Xen DOM0 with SAS, swraid, lvm

 On 10/31/2010 08:57 AM, Gael Le Mignot wrote:
> Hello,
>
> We are using the following setup :
>
> - A  Xen DOM0  with  several  Xen DOMUs,  all  running Debian  GNU/Linux
>   stable, with kernel 2.6.26-2-xen-amd64 ;

Which dom0 kernel are you using?  If its a Debian kernel then you should
probably get in touch with them to report the problem, and/or xen-devel.

    J


> - Disks are either SATA or SAS disks (2 SAS disks for performances and 4
>   SATA disks for bulk storage), all paired in software RAID1, and we use
>   LVM on top of that.
>
> We usually have  no problem with this setup which  is running for almost
> two  years, except  today we  had a  kernel BUG  (I'll  include hardware
> details and syslog trace afterwards).
>
> After this kernel  BUG, most operations were still  working, but several
> disk  related   ones  like   "cat  /proc/mdstat",  "lvs"   were  hanging
> undefinitely, and starting  a Xen VM would fail with  a timeout. Doing a
> reboot fixed everything.
>
> Since  it  included  a  "BUG:  unable  to  handle  kernel  NULL  pointer
> dereference at 0000000000000000", I guess it  is a kernel bug, not a bug
> in Xen or a hardware problem. I know the kernel is a bit old, but we use
> stable Debian on production servers.
>
> If the kernel is  too old for the bug report to  be useful, feel free to
> ignore  it,  but  in  doubt,  I  prefer to  submit  it.  I  can  provide
> additionnal details if needed.
>
> -------
> Here is the syslog about the problem :
> -------
>
> Oct 31 08:09:13 thelma kernel: [8150666.955924] mptscsih: ioc2: attempting task abort! (sc=ffff880039a546c0)
> Oct 31 08:09:13 thelma kernel: [8150666.955967] sd 2:0:5:0: [sdi] CDB: Read(10): 28 00 2d b4 bc af 00 00 08 00
> Oct 31 08:09:16 thelma kernel: [8150669.309069] mptbase: ioc2: LogInfo(0x31140000): Originator={PL}, Code={IO Executed}, SubCode(0x0000)
> Oct 31 08:09:16 thelma kernel: [8150669.517393] mptscsih: ioc2: task abort: SUCCESS (sc=ffff880039a546c0)
> Oct 31 08:09:23 thelma kernel: [8150676.065107] mptbase: ioc2: LogInfo(0x31111000): Originator={PL}, Code={Reset}, SubCode(0x1000)
> Oct 31 08:09:26 thelma kernel: [8150679.516012] mptscsih: ioc2: attempting task abort! (sc=ffff880039a546c0)
> Oct 31 08:09:26 thelma kernel: [8150679.516053] sd 2:0:5:0: [sdi] CDB: Test Unit Ready: 00 00 00 00 00 00
> Oct 31 08:09:27 thelma kernel: [8150680.558931] mptbase: ioc2: LogInfo(0x31111000): Originator={PL}, Code={Reset}, SubCode(0x1000)
> Oct 31 08:09:30 thelma kernel: [8150683.809175] mptsas: ioc2: removing sata device, channel 0, id 7, phy 6
> Oct 31 08:09:30 thelma kernel: [8150683.809216]  port-2:5: mptsas: ioc2: delete port (5)
> Oct 31 08:09:30 thelma kernel: [8150683.867264] mptscsih: ioc2: task abort: SUCCESS (sc=ffff880039a546c0)
> Oct 31 08:09:30 thelma kernel: [8150683.867302] mptscsih: ioc2: attempting task abort! (sc=ffff88003a8eae80)
> Oct 31 08:09:30 thelma kernel: [8150683.867335] scsi 2:0:5:0: [sdi] CDB: Read(10): 28 00 3a 87 82 c7 00 00 08 00
> Oct 31 08:09:30 thelma kernel: [8150683.867434] mptscsih: ioc2: task abort: SUCCESS (sc=ffff88003a8eae80)
> Oct 31 08:09:30 thelma kernel: [8150683.867472] mptscsih: ioc2: attempting bus reset! (sc=ffff880039a546c0)
> Oct 31 08:09:30 thelma kernel: [8150683.867504] scsi 2:0:5:0: [sdi] CDB: Read(10): 28 00 2d b4 bc af 00 00 08 00
> Oct 31 08:09:30 thelma kernel: [8150683.867615] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
> Oct 31 08:09:30 thelma kernel: [8150683.867672] IP: [<ffffffffa006459a>] :mptscsih:mptscsih_bus_reset+0x95/0x104
> Oct 31 08:09:30 thelma kernel: [8150683.867672] IP: [<ffffffffa006459a>] :mptscsih:mptscsih_bus_reset+0x95/0x104
> Oct 31 08:09:30 thelma kernel: [8150683.867733] PGD 3fddd067 PUD 3dd51067 PMD 0
> Oct 31 08:09:30 thelma kernel: [8150683.867771] Oops: 0000 [1] SMP
> Oct 31 08:09:30 thelma kernel: [8150683.867804] CPU 0
> Oct 31 08:09:30 thelma kernel: [8150683.867831] Modules linked in: tcp_diag inet_diag xt_tcpudp xt_physdev iptable_filter ip_tables x_tables ipv6 8021q bridge raid1 \
> md_mod loop parport_pc parport psmouse pcspkr serio_raw i2c_i801 i2c_core rng_core i5000_edac edac_core shpchp pci_hotplug container button joydev evdev ext3 jbd mbc\
> ache dm_mirror dm_log dm_snapshot dm_mod ide_disk ata_generic libata dock usbhid hid ff_memless sd_mod piix floppy ide_pci_generic ide_core ehci_hcd uhci_hcd e1000e \
> mptsas mptscsih mptbase scsi_transport_sas scsi_mod thermal processor fan thermal_sys [last unloaded: scsi_wait_scan]
> Oct 31 08:09:30 thelma kernel: [8150683.868277] Pid: 860, comm: scsi_eh_2 Not tainted 2.6.26-2-xen-amd64 #1
> Oct 31 08:09:30 thelma kernel: [8150683.868310] RIP: e030:[<ffffffffa006459a>]  [<ffffffffa006459a>] :mptscsih:mptscsih_bus_reset+0x95/0x104
> Oct 31 08:09:30 thelma kernel: [8150683.868370] RSP: e02b:ffff88003d89fe00  EFLAGS: 00010246
> Oct 31 08:09:30 thelma kernel: [8150683.868400] RAX: ffff880032ac8002 RBX: ffff880039a546c0 RCX: 000000000000000a
> Oct 31 08:09:30 thelma kernel: [8150683.868449] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff805aaab0
> Oct 31 08:09:30 thelma kernel: [8150683.868497] RBP: ffff88003d85f5e8 R08: 0000000000000001 R09: 00000000ffffff20
> Oct 31 08:09:30 thelma kernel: [8150683.868546] R10: 0000000000000000 R11: 0000010b7494482f R12: ffff88003dfe7008
> Oct 31 08:09:30 thelma kernel: [8150683.868595] R13: ffff88003dfe7000 R14: 0000000000000071 R15: ffff88003d85f000
> Oct 31 08:09:30 thelma kernel: [8150683.868646] FS:  00007fd31f1d8770(0000) GS:ffffffff8053a000(0000) knlGS:0000000000000000
> Oct 31 08:09:30 thelma kernel: [8150683.868696] CS:  e033 DS: 0000 ES: 0000
> Oct 31 08:09:30 thelma kernel: [8150683.868724] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> Oct 31 08:09:30 thelma kernel: [8150683.868773] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Oct 31 08:09:30 thelma kernel: [8150683.868821] Process scsi_eh_2 (pid: 860, threadinfo ffff88003d89e000, task ffff88003fe62040)
> Oct 31 08:09:30 thelma kernel: [8150683.870876] Stack:  00003a3a00000000 ffff880039a546c0 ffff880039a546c0 0000000000002003
> Oct 31 08:09:30 thelma kernel: [8150683.870876]  ffff88003d89fee0 ffffffffa002027f ffff880039a546c0 ffff88003d89fec8
> Oct 31 08:09:30 thelma kernel: [8150683.870876]  0000000000000000 ffffffffa0020f65 ffff88003d89fed0 ffff88003d89fec8
> Oct 31 08:09:30 thelma kernel: [8150683.870876] Call Trace:
> Oct 31 08:09:30 thelma kernel: [8150683.870876]  [<ffffffffa002027f>] ? :scsi_mod:scsi_try_bus_reset+0x4c/0xb4
> Oct 31 08:09:30 thelma kernel: [8150683.870876]  [<ffffffffa0020f65>] ? :scsi_mod:scsi_eh_ready_devs+0x3ce/0x5ac
> Oct 31 08:09:30 thelma kernel: [8150683.870876]  [<ffffffffa0021870>] ? :scsi_mod:scsi_error_handler+0x312/0x4b7
> Oct 31 08:09:30 thelma kernel: [8150683.870876]  [<ffffffff80221555>] ? __wake_up_common+0x41/0x74
> Oct 31 08:09:30 thelma kernel: [8150683.870876]  [<ffffffffa002155e>] ? :scsi_mod:scsi_error_handler+0x0/0x4b7
> Oct 31 08:09:30 thelma kernel: [8150683.870876]  [<ffffffff8023f527>] ? kthread+0x47/0x74
> Oct 31 08:09:30 thelma kernel: [8150683.870876]  [<ffffffff802282ec>] ? schedule_tail+0x27/0x5c
> Oct 31 08:09:30 thelma kernel: [8150683.870876]  [<ffffffff8020be28>] ? child_rip+0xa/0x12
> Oct 31 08:09:30 thelma kernel: [8150683.870876]  [<ffffffff8023f4e0>] ? kthread+0x0/0x74
> Oct 31 08:09:30 thelma kernel: [8150683.870876]  [<ffffffff8020be1e>] ? child_rip+0x0/0x12
> Oct 31 08:09:30 thelma kernel: [8150683.870876]
> Oct 31 08:09:30 thelma kernel: [8150683.870876]
> Oct 31 08:09:30 thelma kernel: [8150683.870876] Code: 00 00 00 48 8b 03 b9 28 00 00 00 48 8b 90 88 00 00 00 41 8a 85 98 00 00 00 84 c0 74 0e 31 c9 3c 02 0f 94 c1 8d \
> 0c cd 02 00 00 00 <48> 8b 02 45 31 c9 45 31 c0 be 04 00 00 00 48 89 ef 0f b6 50 0b
> Oct 31 08:09:30 thelma kernel: [8150683.870876] RIP  [<ffffffffa006459a>] :mptscsih:mptscsih_bus_reset+0x95/0x104
> Oct 31 08:09:30 thelma kernel: [8150683.870876]  RSP <ffff88003d89fe00>
> Oct 31 08:09:30 thelma kernel: [8150683.870876] CR2: 0000000000000000
> Oct 31 08:09:30 thelma kernel: [8150683.876328] ---[ end trace 2f918c612367ed7e ]---
>
>
> -----
> Hardware information
> -----
>
> Hardware is a dual quad-core Xeon, with 64Gb of ECC RAM (no ECC error in
> the IPMI log), with LSI SAS controllers.
>
> Here is a lspci :
>
> 00:00.0 Host bridge: Intel Corporation 5000P Chipset Memory Controller Hub (rev b1)
> 00:02.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x8 Port 2-3 (rev b1)
> 00:04.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x8 Port 4-5 (rev b1)
> 00:06.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x8 Port 6-7 (rev b1)
> 00:08.0 System peripheral: Intel Corporation 5000 Series Chipset DMA Engine (rev b1)
> 00:10.0 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers (rev b1)
> 00:10.1 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers (rev b1)
> 00:10.2 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers (rev b1)
> 00:11.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved Registers (rev b1)
> 00:13.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved Registers (rev b1)
> 00:15.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers (rev b1)
> 00:16.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers (rev b1)
> 00:1c.0 PCI bridge: Intel Corporation 631xESB/632xESB/3100 Chipset PCI Express Root Port 1 (rev 09)
> 00:1d.0 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #1 (rev 09)
> 00:1d.1 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #2 (rev 09)
> 00:1d.2 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #3 (rev 09)
> 00:1d.7 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset EHCI USB2 Controller (rev 09)
> 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d9)
> 00:1f.0 ISA bridge: Intel Corporation 631xESB/632xESB/3100 Chipset LPC Interface Controller (rev 09)
> 00:1f.1 IDE interface: Intel Corporation 631xESB/632xESB IDE Controller (rev 09)
> 00:1f.3 SMBus: Intel Corporation 631xESB/632xESB/3100 Chipset SMBus Controller (rev 09)
> 01:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Upstream Port (rev 01)
> 01:00.3 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express to PCI-X Bridge (rev 01)
> 02:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Downstream Port E1 (rev 01)
> 02:02.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Downstream Port E3 (rev 01)
> 03:00.0 PCI bridge: Intel Corporation 6700PXH PCI Express-to-PCI Bridge A (rev 09)
> 03:00.2 PCI bridge: Intel Corporation 6700PXH PCI Express-to-PCI Bridge B (rev 09)
> 04:01.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1068 PCI-X Fusion-MPT SAS (rev 01)
> 05:01.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1068 PCI-X Fusion-MPT SAS (rev 01)
> 06:00.0 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper) (rev 01)
> 06:00.1 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper) (rev 01)
> 07:01.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1068 PCI-X Fusion-MPT SAS (rev 01)
> 0b:01.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02)
>
> Regards,
>

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